diff --git a/pkg/sip/inbound.go b/pkg/sip/inbound.go
index c7ab8051..2adf661e 100644
--- a/pkg/sip/inbound.go
+++ b/pkg/sip/inbound.go
@@ -820,7 +820,7 @@ func (c *inboundCall) handleInvite(ctx context.Context, tid traceid.ID, req *sip
 		return psrpc.NewError(psrpc.Unimplemented, err)
 	case DispatchNoRuleDrop:
 		c.log().Debugw("Rejecting inbound flood")
-		c.cc.Drop()
+		c.cc.RespondAndDrop(sip.StatusServiceUnavailable, "Service Unavailable")
 		c.close(ctx, callFlood, stats.ClientError("flood"))
 		return psrpc.NewErrorf(psrpc.PermissionDenied, "call was not authorized by trunk configuration")
 	case DispatchNoRuleReject: